Lorin Hochstein Lorin Hochstein - 4 months ago 23
Linux Question

Force unmount of NFS-mounted directory

I have an NFS-mounted directory on a Linux machine that has hung. I've tried to force an unmount, but it doesn't seem to work:

$ umount -f /mnt/data
$ umount2: Device or resource busy
$ umount: /mnt/data: device is busy


If I type "
mount
", it appears that the directory is no longer mounted, but it hangs if I do "
ls /mnt/data
", and if I try to remove the mountpoint, I get:

$ rmdir /mnt/data
rmdir: /mnt/data: Device or resource busy


Is there anything I can do other than reboot the machine?

Answer

You might try a lazy unmount:

umount -l
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